Look on line for drivers for you screen and install them then try to change size for your screen then try the game settings.
If this is not a laptop I would upgrade the card to at least a 960 or above.
It not a laptop , it is a desktop.
OK, after reading the help file for the screen online, I believe it is about the monitor, because I have 19" screen monitor and according to this model, it supports 1280 × 1024 resolution as "recommended" and it is set as the maximum resolution this monitor can handle.
Well I have been thinking of getting a new monitor. this is a good time to get rid of the old monitor.